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Adaptive incremental blood pressure monitor

  • US 4,461,266 A
  • Filed: 04/29/1982
  • Issued: 07/24/1984
  • Est. Priority Date: 04/29/1982
  • Status: Expired due to Term
First Claim
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1. A method for automatically measuring blood pressure in a living animal test subject, comprising the steps of:

  • (a) applying a predetermined initial pressure externally to the body of the test subject adjacent a blood vessel;

    (b) recording the value of the applied pressure and the amplitude of pressure pulses withing the blood vessel due to the operation of the heart of the test subject;

    (c) incrementally increasing the applied pressure at least once and repeating the recording step (b) after each increment;

    (d) if the amplitudes of the pulses increase with incremental increases of the applied pressure above the predetermined pressure and then decrease, (i) designating the applied pressure when the pulse amplitude is greatest as mean arterial pressure, (ii) designating as systolic pressure the applied pressure above mean arterial pressure where the pulse amplitude is a first fixed fraction of the amplitude at mean arterial pressure, and (iii) designating as diastolic pressure the applied pressure below mean arterial pressure at which the pulse amplitude is a second fixed fraction of the amplitude at mean arterial pressure;

    (e) if the amplitudes of the pulses first decrease with incremental increases of the applied pressure above the predetermined initial pressure, changing said applied pressure to a new applied pressure that is a certain amount below the predetermined initial pressure, and repeating steps (b)-(d) until mean arterial pressure and systolic pressure are determined;

    (f) halting the incremental changes in applied pressure after the determination of systolic, diastolic and mean arterial pressure; and

    (g) relieving the applied pressure.

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